HSS/UDM Expert (CS Core Network) | ZTE | Islamabad, Pakistan

Tech Junction Ltd; Islamabad; On-site; PKR 1,800,000 - 2,600,000; Full time

Job summary

ZTE is seeking an experienced HSS/UDM Expert with a strong CS Core background to support deployment, integration, operations, optimization, and troubleshooting across subscriber management platforms in Islamabad. You will work with Core Network, IMS, VoLTE, Operations, and Customer Support to ensure stability and optimal subscriber experience.

The role requires deep expertise in HSS/UDM architectures, Diameter signaling, subscriber provisioning, VoLTE services, and CS Core integration, with

Qualifications

• Bachelor’s degree in Telecommunications Engineering or related field.
• 5–6+ years of experience in Telecom Core Network environments.
• Strong hands-on expertise with HSS/UDM platforms and related deployments.
• Solid CS Core background including MSC, MGW, HLR.

Responsibilities

• Deploy, integrate, configure, and operate HSS and UDM platforms.
• Manage subscriber provisioning, authentication, and profile management.
• Troubleshoot complex HSS/UDM/IMS/VoLTE service issues.
• Support CS Core environments including HLR, MSC, and MGW integrations.
• Analyze KPIs, alarms, traces, and performance indicators to identify issues.
• Perform root cause analyses and implement corrective actions.
• Support Diameter, SS7, and SIGTRAN signaling troubleshooting.
• Participate in software upgrades, patches, migrations, and network enhancements.
• Support 4G EPC and 5G Core subscriber management services.
• Coordinate with customers, operations teams, vendors, and engineering.
• Develop technical reports, operational documentation, and troubleshooting procedures.
• Ensure service availability, network stability, and performance targets.

Skills

HSS/UDM platforms

CS Core background

Diameter signaling

SS7/SIGTRAN

IMS architecture

VoLTE services

Troubleshooting L2/L3

Subscriber management

KPI monitoring

Deployment & integration

Telecom Core Network

Education

Bachelor’s Degree in Telecommunications Engineering

Tools

ZTE Core Network platforms

Network scripting

Job description

Job Title: HSS/UDM Expert (CS Core Network) | ZTE | Islamabad, Pakistan

Job Location: Islamabad, Pakistan

Job Type: Full-Time

Industry: Telecommunications | Mobile Core Networks | IMS | VoLTE | 4G LTE | 5G Core

Position Summary

ZTE is seeking an experienced HSS/UDM Expert with a strong Circuit Switched (CS) Core background to support deployment, integration, operations, optimization, and troubleshooting activities across subscriber management platforms. The role focuses on HSS, UDM, IMS, VoLTE, and Core Network services within modern 4G and 5G telecommunications environments.

Detailed Job Description

As an HSS/UDM Expert, you will be responsible for managing critical subscriber data management platforms that support voice, messaging, authentication, mobility, and data services. You will work closely with Core Network, IMS, VoLTE, Operations, and Customer Support teams to ensure platform stability, service continuity, and optimal subscriber experience.

The role requires strong expertise in HSS and UDM architectures, Diameter signaling, subscriber provisioning, VoLTE services, and CS Core integration. You will provide advanced L2/L3 troubleshooting support, conduct performance analysis, and participate in deployment and network modernization initiatives.

Key Responsibilities

• Perform deployment, integration, configuration, and operational support for HSS and UDM platforms.
• Manage subscriber provisioning, authentication, and profile management functions.
• Troubleshoot complex HSS, UDM, IMS, and VoLTE service issues.
• Support CS Core network environments including HLR, MSC, and MGW integrations.
• Analyze KPIs, alarms, traces, and performance indicators to identify service-impacting issues.
• Perform root cause analysis and implement corrective actions.
• Support Diameter, SS7, and SIGTRAN signaling troubleshooting activities.
• Participate in software upgrades, patches, migrations, and network enhancements.
• Support 4G EPC and 5G Core subscriber management services.
• Coordinate with customers, operations teams, vendors, and engineering departments.
• Develop technical reports, operational documentation, and troubleshooting procedures.
• Ensure service availability, network stability, and performance targets are achieved.

Required Qualifications & Skills

• Bachelor’s Degree in Telecommunications Engineering, Electronics Engineering, Computer Science, Information Technology, or a related discipline.
• 5-6+ years of experience in Telecom Core Network environments.
• Strong hands-on expertise with HSS and/or UDM platforms.
• Experience in HSS/UDM deployment, integration, operations, and troubleshooting.
• Solid CS Core background with hands-on experience in:
• MSC (Mobile Switching Center)
• MGW (Media Gateway)
• HLR (Home Location Register)
• Strong understanding of IMS architecture and services.
• Experience supporting VoLTE services.
• Advanced knowledge of Diameter signaling protocols.
• Strong understanding of SS7 and SIGTRAN signaling networks.
• Experience with subscriber management and authentication systems.
• Knowledge of EPC and 5G Core network architectures.
• Strong KPI monitoring, trace analysis, and performance optimization capabilities.
• Advanced L2/L3 troubleshooting and fault isolation skills.
• Experience in customer-facing telecom support environments.

Core Technologies

Subscriber Management

• HSS (Home Subscriber Server)
• UDM (Unified Data Management)
• HLR (Home Location Register)

Core Network

• MSC
• MGW
• EPC
• 5G Core

IMS & Voice

• IMS
• VoLTE
• SIP
• Diameter

Signaling Protocols

• Diameter
• SS7
• SIGTRAN

Nice-to-Have Skills

• Experience with ZTE Core Network platforms.
• Experience supporting large-scale VoLTE deployments.
• Knowledge of 5G Standalone subscriber management architecture.
• Experience with cloud-native telecom platforms.
• Familiarity with network automation and scripting.
• Exposure to policy control and subscriber data orchestration platforms.

Recruitment Pro Tip

For HSS/UDM positions, hiring managers highly value candidates who can demonstrate hands-on troubleshooting of subscriber-related service issues. Highlight examples involving VoLTE registration failures, IMS authentication problems, Diameter signaling investigations, HSS/UDM migrations, subscriber provisioning issues, and KPI improvements. Quantifiable achievements related to service availability, subscriber experience, and incident resolution will significantly strengthen your application.